JPS6440913A - Compact zoom lens - Google Patents

Compact zoom lens

Info

Publication number
JPS6440913A
JPS6440913A JP19836987A JP19836987A JPS6440913A JP S6440913 A JPS6440913 A JP S6440913A JP 19836987 A JP19836987 A JP 19836987A JP 19836987 A JP19836987 A JP 19836987A JP S6440913 A JPS6440913 A JP S6440913A
Authority
JP
Japan
Prior art keywords
group
lens
negative
positive
serves
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP19836987A
Other languages
Japanese (ja)
Other versions
JP2556046B2 (en
Inventor
Kazuyoshi Hata
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Minolta Co Ltd
Original Assignee
Minolta Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Minolta Co Ltd filed Critical Minolta Co Ltd
Priority to JP62198369A priority Critical patent/JP2556046B2/en
Priority to US07/230,173 priority patent/US5009491A/en
Publication of JPS6440913A publication Critical patent/JPS6440913A/en
Application granted granted Critical
Publication of JP2556046B2 publication Critical patent/JP2556046B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PURPOSE:To obtain a large-diameter, high-performance zoom lens although it is of lightweight, compact, and simple constitution by composing a 1st group of one negative lens element formed by cementing a negative and a positive lens together and satisfying specific conditions. CONSTITUTION:This lens system consists of three negative, positive, and positive groups I-III. In zooming operation, while the image plane position of the 1st group I is held constant, the 1st group I and 2nd group II move, the 2nd group II serves for power variation, and the 3rd group III is fixed and serves for image formation. Here, the 1st group I is composed of one cemented lens of one negative lens and one positive lens and satisfies an inequality I. Here, psiI and psiII are refracting power values of the 1st and 2nd groups, fw the composite focal length at the wide-angle end, R the radius of curvature, DELTAnu the difference between the Abbe number of the negative lens the Abbe number of the positive lens in the 1st group. Consequently, the zoom lens which has a large diameter, but is short in overall length and small in weight is composed of a small number of elements and high performance is obtained over the entire zoom range.
JP62198369A 1987-08-07 1987-08-07 Compact zoom lens Expired - Lifetime JP2556046B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP62198369A JP2556046B2 (en) 1987-08-07 1987-08-07 Compact zoom lens
US07/230,173 US5009491A (en) 1987-08-07 1988-08-08 Compact zoom lens system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62198369A JP2556046B2 (en) 1987-08-07 1987-08-07 Compact zoom lens

Publications (2)

Publication Number Publication Date
JPS6440913A true JPS6440913A (en) 1989-02-13
JP2556046B2 JP2556046B2 (en) 1996-11-20

Family

ID=16389963

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62198369A Expired - Lifetime JP2556046B2 (en) 1987-08-07 1987-08-07 Compact zoom lens

Country Status (1)

Country Link
JP (1) JP2556046B2 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6349002B1 (en) 1999-04-27 2002-02-19 Nikon Corporation Variable focal length lens system and imaging apparatus equipped with thereof
JP2005308953A (en) * 2004-04-20 2005-11-04 Konica Minolta Opto Inc Variable power optical system, image pickup lens device and digital apparatus
JP2006039182A (en) * 2004-07-27 2006-02-09 Konica Minolta Photo Imaging Inc Imaging apparatus
JP2008058600A (en) * 2006-08-31 2008-03-13 Canon Inc Zoom lens and imaging apparatus having the same
US7474472B2 (en) 2006-06-06 2009-01-06 Olympus Imaging Corp. Zoom lens, and imaging system comprising the same
US8411378B2 (en) 2009-10-07 2013-04-02 Olympus Imaging Corp. Zoom lens and image pickup apparatus equipped with same

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6349002B1 (en) 1999-04-27 2002-02-19 Nikon Corporation Variable focal length lens system and imaging apparatus equipped with thereof
JP2005308953A (en) * 2004-04-20 2005-11-04 Konica Minolta Opto Inc Variable power optical system, image pickup lens device and digital apparatus
JP2006039182A (en) * 2004-07-27 2006-02-09 Konica Minolta Photo Imaging Inc Imaging apparatus
US7474472B2 (en) 2006-06-06 2009-01-06 Olympus Imaging Corp. Zoom lens, and imaging system comprising the same
JP2008058600A (en) * 2006-08-31 2008-03-13 Canon Inc Zoom lens and imaging apparatus having the same
US8411378B2 (en) 2009-10-07 2013-04-02 Olympus Imaging Corp. Zoom lens and image pickup apparatus equipped with same

Also Published As

Publication number Publication date
JP2556046B2 (en) 1996-11-20

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Legal Events

Date Code Title Description
EXPY Cancellation because of completion of term